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A 2‐Pyrazoline‐Functionalized Zinc Complex: Available N–Ag I Interaction Modulating Its Fluorescence Properties
Author(s) -
Zhang Huihui,
Dou Wei,
Liu Weisheng,
Tang Xiaoliang,
Qin Wenwu
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201001083
Subject(s) - chemistry , fluorescence , pyrazoline , intramolecular force , titration , zinc , photochemistry , quantum yield , hydrazone , hydrogen bond , proton nmr , solvent , inorganic chemistry , crystallography , molecule , stereochemistry , medicinal chemistry , organic chemistry , physics , quantum mechanics
A readily available fluorescent sensor [Zn(1‐phenyl‐3‐methyl‐5‐hydroxy‐4‐pyrazolyl phenyl ketone benzoyl hydrazone) 2 ] (Zn‐PMPB) with simple and conformationally adaptable receptors for silver cation has been designed. The central Zn 2+ ion and ligands in the complex have a synergistic effect on binding interactions with the Ag + ion. Zn‐PMPB was characterized in detail by various spectroscopic techniques and single‐crystal X‐ray diffraction. Its photochemical properties for detecting the Ag + ion in HEPES buffered (10 m M , pH 7.1) MeOH/H 2 O (4:6) solution are described. This fluorescent sensor has a negligible quantum yield (0.0011) due to deactivation of solvent hydrogen bonding, whereas a significant increase in fluorescence is observed upon complexation with Ag + . NMR titration and UV/Vis spectroscopy suggest that the Ag + ions bind to the N2 atom in the pyrazoline group in Zn‐PMPB, which facilitates the intramolecular charge transfer emission of pyrazoline.